You have a right to know why you're fired. You can't be fired for legally protected reasons. If you're fired for revealing your wage, your employer is in a lot of trouble.
Yes, you cannot be fired for legally protected reasons. Well, the company that fired you also knows that. So they come up with a reason that is not protected( "Does not fit well with the company culture"). The burden of proof is upon the ex-employee to show that they were let go for a protected reason(It is a very high burden).
